Collapsible and portable core form



July 6,1 26. 1,591,907

H. J. YAGER OOOOOOOOOOOOOOOOOOOOOOOOOOOO RM ed Au ust Patented July 6, 1926.- I

gHa'nvEYJ vaenn, or SEATTLE, wasn 'us'rou.

. coL ArsreLn Ann PORTABLE cons Fem.

Application filed August 1, 19-35. Serial Now 47,603.

' l ligu-re 2is a sectional view taken on a plane extending horizontally through the core form, chimney or elevator shaft and outside form;

l igure 3is a rdetail sectional view taken on the. vertical plane indicatedby the line 3+3 of Figure 2;

.Figure 1 is a detail. plan viewot-the 'recess mold block etthe core form, and

Figure 5 is a :detailview in side elevation of the core forn'isupporting truss.

Corresponding and like parts are referred to in the following description, and designated in-the several "vie'w's'aof the accompanying drawings, by similar reference characters.

The mold of which the core form forms a part includes an outside form which is of the usual construction and comprises sheeting boards 1, studs 2 and wale pieces 3.

The core form is, in accordance with my invention, made up of opposite similar sides 4 and l and opposite similar sides 5 and 5 the latter being located between the former. Diagonally opposite corners of the core form are beveled. as indicated by the numeral 6 and positioned at and contacting with these corners are removable strips 7 whichcorrespond in length to the corresponding dimension of the core form and which are of right-angled triangular formation in cross section. Each of the sides 45 comprises sheeting boards 8 and wale pieces 9 which are connected together by nails 10 or the like. The wale pieces 9 oi the sides and 1 are located between and having their ends spaced from the corresponding parts of the sides 5 and 5. Wedges 11 are located between the ends of the wale pieces 9 of the sides 4 and 4 and the inner sides of the wale pieces =9v ofv the sides 5 and 5. The 'wa-le pieces 9 01? the side 5v are spaced from'thesides 4, and'the wale pieces 9 f the side S are spaced from the side 45, and wedges 12 are located between said wale piecesand the sides 4and ,4. Stays 13 are nailed or otherwise secured as zit-14 to the upper edges of the sidesQt-S and strips 7. V r W The sides 4-5 of the core form are retained in the desirecl spaced relation with respect to the sides of the outside :torn'rby bolts lb -and Wire loops :16, and :theco'reform is adapted tobe supported by trusses l7 and timbers 18 mounted upon'the trusses 17-. Eaclrot the trusses 17 comprisesja top chord 1-9 provided with downwardly and outwardly beveled ends 20;, posts, 21 pivotally connected as at22 to the underside of the :chord 19, and ajbottom chord oits'ectional formation. The'cho-rd sections 23 and 2 b are pivota-ll'y connected together as at ,24

- and to the posts 21f'as at ,The chord section 23* fis longer than theschord section 23*,ai1dis provided with alongitudinal series, of openings26 through alselected one of which the pivot24 ,passesg This chord section is also-provided with a hook-27, which embraces chord sectionj23 f to. limit the downwardmovement otthe sections.

The core form is adapted to be used for building the entire chimney or elevator shaft. After a section of the structure is completed, the core form is taken apart and removed and again erected and supported in an upwardly extending position with relation to the completed section, as clearly illustrated in Figure 1. In this and Figure 2, 28 designates the partly completed chimney or elevator shaft. Opposite sides of the core form are provided with substantially wedge shaped mold blocks 29 which are adapted to form recesses 30 in inner opposite sides of the structure 28. Mold blocks 29 are provided with inwardly and upwardly inclined lower the structure 28 after the removal of the core from, cables 32 are provided. The cables 32 extend upwardly through the core form and are connected to the timbers 18, the chords 19 of the trusses, and to eyes 33 secured to the free ends of the truss sections 23, as clearly illustrated in Figure 1. An upward pull on the cables 32 will break the chord sections 23 and 23 upwardly and thus will withdraw the posts 21 from the recesses 30. After this has been done the trusses 17 and timbers 18 may be withdrawn from the completed Section of the structure. The trusses 17 may be used after the completion of the structure for the purpose of supporting a scaffold within the structure to permit it to be lined with bricks, and to this end the chords 19 are provided with eyebolts 34.

From the foregoing description, taken in connection with the accompanying drawings, it will be understood that the core form may be readily taken apart and removed from the completed section of the structure after the removal of the bolts 15 and wires 16. To permit the core form to be taken apart, it is only necessary to remove the stays 13, strips 9, and wedges 11 and 12. It should also be understood that the core form may be readily erected, and that as it provides each completed section of the structure with the recesses 30 it may be readily supported from a completed section in position to permit the building of the next section.

While I have described the principle of operation of the invention, together with the device which I now consider to be the best embodiment thereof, I desire to have it understood that the device shown is merely illustrative, and that such changes may be made when desired as are within the scope of the invention as claimed.

What is claimed is:

1. A core form comprising separable sides and provided with diagonally opposite beveled corners, strips located at and contacting with said corners, and wedges located between the sides.

2. A core form comprising separable sides and having beveled corners, strips arranged at and contacting with said corners, each side including wale pieces, wedges located between certain of said walc pieces and certain sides, and wedges located between the ale pieces.

3. A core form provided with wedge blocks adapted to form recesses in inner opposite sides of the structure being built, a truss for supporting the core form and provided with posts entering said recesses, and means for withdrawing the truss.

4. A mold for building hollow concrete structures including a core form )rovided at its outer side with mold blocks adapted to form recesses in the inner faces of the structure, and a core supporting member adapted to be supported by the bottom walls of said recesses.

5. A mold for building hollow concrete structures including a core form provided at its outer side with mold blocks adapted to form recesses in the inner faces of the structure and having horizontal bottom walls and upwardly and inwardly inclined inner walls, and a core supporting member adapted to be supported by the bottom walls of the recesses.

In testimony whereof I afiix my signature.

HARVEY J. YAGER. 

